monetary policy for the u.s. economy. >> this time, there will be change. or there will be chaos. >> reporter: anonymous, a loosely affiliated network of hackers spread across the globe, and during the hack of the fed, anonymous stole the log-in credentials of 4,000 bankers at across the country. allowing them to disrupt a key emergency communication system. >> citizens of the world. we have seen the erosion of due process. the delusion of constitutional rights. >> reporter: greg house, a former member of anonymous, says expect more attacks on the government. >> all these big bankers and all these big rich people who have caused a lot of the problems we've had for the last few years, are not getting prosecuted. >> reporter: the fbi has had some success against suspected anonymous associates. arresting at least 20, including one man during this bust, caught on a web cam. >> fbi! get down right now! >> reporter: but finding and arresting members of anonymous is challenging. for the fbi, each targeted computer network is a crime scene. >> you want to look for the digital footprints.